I agree 100% on cleaning the threads just as you described, that's exactly how I do it. You'll never get an accurate torque reading with rusty/dirty/rough threads.
In fact tractor vet - you may remember the reason I have this particular head off was due to a blown gasket - on an engine that was recently rebuilt by the previous owner. (new to me farmall 560)
What I cleared out all of those bolt holes in the block answered the question for me of why this newly installed gasket probably blew. I don't think they've been cleaned in 60 years. Thick,dry, black gritty nastiness. I had to chase them and flush them several times.
Same with what I wire brushed off the bolt threads. Nasty.
had the head been on there for 20 years that'd be one thing, but as I said, this thing was just rebuilt. Somebody clearly rushed the job.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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